Scrub brush



FIG. 1 is a left side elevational view of a scrub brush showing my new design, the right side elevational view being the mirror opposite thereof;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a front elevational view thereof;

FIG. 6 is a perspective view showing the top and front surfaces thereof; and,

FIG. 7 is a perspective view showing the bottom and right side surfaces. 

The ornamental design for a scrub brush, as shown and described. 